I also always replace the oil/oil filter as it has sat in the engine for 6 months. Change the tranny fluid if it hasn't been done in a couple years. Replace impeller as stated above and reinstall any required plugs. Check your belts and maybe change spark plugs if it hasn't been done in a few years either. Just give it a once over to make sure all your Navi lights work, you got all the life jackets back in....whatever else you may have taken out. Connect the trailer and make sure all lights work. Air in the tires if needed. I usually clean the boat again even though I did it before I put it away.

I also always replace the oil/oil filter as it has sat in the engine for 6 months. Change the tranny fluid if it hasn't been done in a couple years. Replace impeller as stated above and reinstall any required plugs. Check your belts and maybe change spark plugs if it hasn't been done in a few years either. Just give it a once over to make sure all your Navi lights work, you got all the life jackets back in....whatever else you may have taken out. Connect the trailer and make sure all lights work. Air in the tires if needed. I usually clean the boat again even though I did it before I put it away.

Give it a big hug and a kiss if you haven't seen it in a few months!

Go shred the liquid gnar!

Just and FYI, its never a good idea to leave the used oil in the crankcase during storage. Used oil is acidic and corrosive and will etch the soft metals such as bearing and pistons. It also contains moisture, which is a normal byproduct of combustion as well as the environment the boat is used in. The oil and filter should always be changed in Fall and the engine run afterwards to circulate the fresh clean oil.

^^^ I do an oil change before I put the boat away and when I pull it out again for the spring. Are you saying I should completely drain all the oil out of the engine before putting away for the season?

^^^ I do an oil change before I put the boat away and when I pull it out again for the spring. Are you saying I should completely drain all the oil out of the engine before putting away for the season?

No. It sounded like you left the previous season's oil in for the winter and then changed for Spring, my bad. And no, don't drain and leave empty as this allows condensation to build up in the crankcase as well. To be honest, it's not necessary to do an oil change in the Spring, if one was done in Fall. But it doesn't hurt.

^^^ I do an oil change before I put the boat away and when I pull it out again for the spring. Are you saying I should completely drain all the oil out of the engine before putting away for the season?

Just change it at the end of the season so you don't leave used acidic oil in it all winter. There is no need to do it again in the spring.

Just and FYI, its never a good idea to leave the used oil in the crankcase during storage. Used oil is acidic and corrosive and will etch the soft metals such as bearing and pistons. It also contains moisture, which is a normal byproduct of combustion as well as the environment the boat is used in. The oil and filter should always be changed in Fall and the engine run afterwards to circulate the fresh clean oil.

I just change my oil before I put it up for the season. I see no need to waste fresh oil unless someone has a valid reason? If unused oil were to lose it's viscosity after 3 months then you'd see a lot oil on clearance racks. Something I've never seen in my life.

Has nothing to do with viscosity Brandon. Once the oil is introduced to oxygen then oxidation starts to take place. Oil is sealed in a container on the shelf. Once the seal is broken the "clock" starts. The "clock" speeds up when the oil is heated.

The debate on changing oil after the season ends or before the season starts will always be argued. But the results of excessive wear to engines either way has yet to be proven. Either way isnt going to cause any excessive damage to your engine.